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Printing PDF417 in c sharp s DATA ACCESS AND SECURITY

CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)

where and and ) and ... ; It doesn t matter how much information you give me about number of customers, number of orders, number of order lines, number of days you ve traded, number of days since the start of month, number of products ever appearing in order lines, average number of order lines per order, average number of orders per customer, average number of orders per day, or average number of order-lines per product. There is no way I can estimate how many customers I have to report unless I run part of the query before deciding what to do next. So what does Oracle do Again it guesses 5 percent. This might be a perfect estimate, it might be adequate, or it might be a total disaster. And if you want to report the customers who ordered exactly four products, the guess is 1 percent. (Pause for thought: According to Oracle, 5 percent ordered more than four products, 1 percent ordered exactly four products, and 5 percent ordered fewer than four products so the optimizer has just lost 89 percent of your customers somewhere!) In fact, as you saw in the earlier part of this chapter, I ve discovered what seems to be a bug in this type of query, which means you may find that Oracle s estimate of customers is just one, but the 1 percent and 5 percent reappear if you push the subquery up the parse tree with the push_subq hint. This problem is much harder to fix, of course, than the previous example. You don t need just one value; you need a list of customer IDs, and you need to know how big it is. There are strategies to deal with this type of problem, of course. In this case, perhaps, you would put the customers table with its subquery into an inline view with the no_merge hint and then use a cardinality hint on the inline view to give the optimizer the right idea about the number of customers it would return. Every complex case requires its own special treatment, but a few generic strategies tend to keep reappearing. There are simpler examples in which derived statistics or partial results need to be created before the optimizer can handle the more complex types of queries, and Oracle has introduced features to help. The obvious examples come from dependent columns, for which there are two strategies: dynamic sampling from 9i onward, and extended statistics in 11g. Imagine you run a parcel delivery service, with the marketing slogan that any parcel not delivered within 48 hours will be delivered free. As part of the quality control process, you have a query that lists all the parcels you ve picked up in the last 24 hours that have not yet been delivered. For the sake of getting some easy numbers into the arithmetic, let s assume that you ve been delivering 1,000 parcels per day for the last three years (call it 1,000 days). The query you run will look something like this: select ... from ... parcels ... where and and ; pcl.pickup_date >= sysdate 1 pcl.delivery_status = In-transit ... pcl, ord.id_cust ord.date_placed orl.ord_id = cus.id >= trunc(sysdate,"MM") = ord.id

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Summary

Start by going through the initialization steps explained in recipe 3-9. Use the following code, copied from that recipe, which gives you access to all images inside the image file you loaded (some image files, such as a texCube, contain multiple images): namespace GrayContentPipeline { [ContentProcessor(DisplayName = "GrayScaleProcessor")] public class ExtentedTextureProcessor : TextureProcessor { public override TextureContent Process(TextureContent input, ContentProcessorContext context) { TextureContent texContent = base.Process(input, context); texContent.ConvertBitmapType(typeof(PixelBitmapContent<Color>)); for (int face = 0; face < input.Faces.Count; face++) { MipmapChain mipChain = input.Faces[face]; for (int mipLevel = 0; mipLevel < mipChain.Count; mipLevel++) { ... } } return texContent; } } }

Under the Stored Procedures node select the FilmGetCrewInfo stored procedure and click Finish. Right-click on the designer surface and select Add Function Import to bring up the screen shown in Figure 8-13. (I also clicked Get Column Information button when completed the other information to populate the stored procedure column information section).